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https://issues.apache.org/jira/browse/SPARK-31227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-31227:
-----------------------------------
Assignee: Hyukjin Kwon
> Non-nullable null type should not coerce to nullable type
> ---------------------------------------------------------
>
> Key: SPARK-31227
> URL: https://issues.apache.org/jira/browse/SPARK-31227
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Hyukjin Kwon
> Assignee: Hyukjin Kwon
> Priority: Minor
>
> {code}
> scala> spark.range(10).selectExpr("array()").printSchema()
> root
> |-- array(): array (nullable = false)
> | |-- element: null (containsNull = false)
> scala> spark.range(10).selectExpr("concat(array()) as arr").printSchema()
> root
> |-- arr: array (nullable = false)
> | |-- element: null (containsNull = false)
> scala> spark.range(10).selectExpr("concat(array(), array(1)) as
> arr").printSchema()
> root
> |-- arr: array (nullable = false)
> | |-- element: integer (containsNull = true)
> {code}
> The last case should not coerce to nullable type.
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